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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-898) Sequential generation of block ids
Date Mon, 01 Mar 2010 19:08:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839805#action_12839805
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Dmytro Molkov commented on HDFS-898:
------------------------------------

I just ran a tool on FB cluster. Here is the output:

Bit map applied: ff00000000000000
Number of collisions = 0
=====================
Number of blocks = 57909756
Number of negtive ids  = 57909756
Number of positive ids = 0
Largest segment = (-277768208, 9223372036854775807)
Segment size = 9.223372037132544E18
Expected max = 318542942464


> Sequential generation of block ids
> ----------------------------------
>
>                 Key: HDFS-898
>                 URL: https://issues.apache.org/jira/browse/HDFS-898
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.20.1
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.22.0
>
>         Attachments: DuplicateBlockIds.patch, FreeBlockIds.pdf, HighBitProjection.pdf
>
>
> This is a proposal to replace random generation of block ids with a sequential generator
in order to avoid block id reuse in the future.

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